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Meaning of milliroentgen

mil•li•roent•gen

Pronunciation: (mil'u-rent"gun, -jun, -runt"-), [key]
— n.
  1. a unit of radiation equal to one thousandth of a roentgen. Abbr.: mR, mr
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.